/Engine/Source/Runtime/ImageWriteQueue/Public/ImageWriteQueue.h
Where the queue is empty, the future will be immediately fulfilled, and callback invoked on the next main thread tick.
A future that is fulfilled when the current state of the queue has been completely finished
[TFuture](API\Runtime\Core\Async\TFuture)< void > CreateFence ( const [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< void()> & InOnFenceReached )